摘要
本文提出了一种基于牛顿迭代法的方位角解算方法,该方法解决了钻井姿态测量过程中铁磁性套管的磁化作用导致方位角解算不准确的问题.在分析了磁测斜仪环境磁场和建立磁性套管磁干扰模型的基础上提出了利用牛顿迭代法解算钻具方位角和套管干扰磁场模型参数.同时利用误差传递原理对影响方位角解算精度的因素进行了分析.最后针对该方法进行了一系列的仿真验证,仿真结果表明:相比于传统解算算法,该方法能够更准确地解算出钻井的方位角.同时,当外界条件一定时,方位角误差主要受顶角θ的影响,当θ=arctan(tanIcosφ)时,误差最大,所以在实际测量过程中可以通过尽量避免θ=arctan(tanIcosφ)来减小误差.
In the process of oil well azimuth measurement,the magnetization of casing can cause the az-imuth Angle solve inaccurate.A azimuth solve algorithm based on the Newton iteration method was put forward.The magnetic disturbance model of oil well was established by analysis the magnetic inclinome-ter measuring magnetic field environment.The Newton iteration method was proposed to solve azimuth angle and casing drilling tool interference magnetic field model parameters,and the calculation of azimuth error was analyzed by error transfer theory.The simulation results show that compared with the tradi-tional decoding algorithm, this method can calculate more accurately. Moreover,when θ =arctan（tanI cosφ）,the azimuth error can be maximum,so we can avoidθ = arctan（tanI cosφ）as far as possible to reduce the error.
出处
《测试技术学报》
2015年第1期63-67,共5页
Journal of Test and Measurement Technology
关键词
磁测斜仪
磁化作用
牛顿迭代法
方位角
油井套管
magnetic inclinometer
magnetization
Newton iteration method
azimuth
oil well casing
